Semiconductor device for electrostatic discharge protection
View Patent ↗A semiconductor device for electrostatic discharge protection is disclosed, and at least comprises a high-voltage parasite silicon controlled rectifier (HVSCR) and a diode. The HVSCR has an anode and a cathode, and the cathode of HVSCR is coupled to a ground. The diode, coupled to the HVSCR in series, also has an anode and a cathode. The anode of the diode is coupled to the anode of the HVSCR, and the cathode of the diode is coupled to a terminal applied with a positive voltage. The diode has a second conductivity type zone that could be constructed to form several strips or small blocks spaced apart from each other. Those small blocks could be any shapes and arranged regularly or randomly.
1. A semiconductor device for electrostatic discharge protection, comprising:
a high-voltage parasitic silicon controlled rectifier (HVSCR), having an anode and a cathode, the cathode of HVSCR coupled to a ground; and
a diode, coupled to the HVSCR in series, and the diode having an anode and a cathode, the anode of the diode coupled to the anode of the HVSCR, and the cathode of the diode coupled to a terminal applied with a positive voltage.
2. The device according to claim 1 , wherein the HVSCR comprises:
a plurality of N-type and P-type doping regions, alternatively and contiguously formed within a first N-well.
3. The device according to claim 2 , wherein the HVSCR further comprises:
a P-type doping region disposed between two N-type doping regions, and three said doping regions being spaced from the first well and formed in a P-substrate, and said P-type doping region coupled to the ground.
4. The device according to claim 3 , wherein the diode comprises a P-type zone and a N-type doping region formed within a second N-well.
5. The device according to claim 4 , wherein the P-type zone of the diode is coupled to one of the N-type doping regions within the first well of the HVSCR.
6. The device according to claim 4 , wherein a N-type doping region is formed within the second N-well, and spaced apart from the P-type zone.
7. The device according to claim 6 , wherein the N-type doping region formed within the second N-well is connected to the terminal applied with the positive voltage.
8. The device according to claim 4 , wherein the P-type zone comprises a plurality of P-type strips spaced apart from each other, and the P-type strips are coupled together to one of the N-type doping regions in the first N-well.
9. The device according to claim 4 , wherein the P-type zone of the diode comprises a plurality of P-type small blocks spaced apart from each other, and the P-type small blocks are coupled together to one of the N-type doping regions in the first N-well.
10. The device according to claim 9 , wherein each of the P-type small blocks has a rectangular cross-section.
11. The device according to claim 9 , wherein each of the P-type small blocks has a rhombic cross-section.
12. The device according to claim 9 , wherein each of the P-type small blocks has a rounded cross-section.
13. The device according to claim 9 , wherein the P-type small blocks are arranged as a matrix.
14. The device according to claim 9 , wherein the P-type small blocks are arranged as a tessellated pattern.
15. The device according to claim 9 , wherein the P-type small blocks are arranged as a honeycombed-like pattern.
16. The device according to claim 9 , wherein the P-type small blocks are distributed as a cellular pattern.
17. The device according to claim 9 , wherein the P-type small blocks are arranged to form a plurality of columns in parallel.
18. The device according to claim 17 , wherein the P-type small blocks of each column are staggered to the blocks of adjacent column.
19. The device according to claim 17 , wherein the P-type small blocks of each column are adjoined to each other.
20. The device according to claim 17 , wherein the P-type small blocks of each column are apart from each other.
21. The device according to claim 2 , wherein the P-type doping regions within the first N-well of SCR are coupled to each other.
22. The device according to claim 3 , wherein the N-type doping regions of SCR outside the first N-well are coupled to each other.